High and low water alarm.



G. BRENT.

HIGH AND LOW WATER ALARM.

APPLIOATIOH FILED JAN. 2, 1907.

978,983, Patented Dec.20, 1910.

' '/IIIIIIIIIIIII]I| VIII/III, I "4. A A

7%71255555; fizz/alibi QHALA K mlw 4 KM 2,

rarrnn'r OFFICE ITNITE STATES CHARLES BRENT, OF BRANDON, MANITOBA, CANADA.

men AND LOW wa'rnn ALARM.

Patented Dec. 20, 1910.

978,983. Specification 0; Letters Intent.

Application filed January 2. 1907. Serial No. 850,856.

To all whom it may concern: boiler and water column may beprovided Be it known that I, CimnLEs BRENT, rewith my device, but I have shown in the siding at Brandon, in the Province of Mandrawing one embodiment wherein the boiler itoba and Dominion of Canada, have in Water l mn 1 is provided with a steam vented certain new and useful Improvep p 2 leading t the p of an alarm head ments in High and Low Water Alarms, of 3 ded With a valve 4. The boiler water which the following is a full, clear, and (30 is further provided With aiwater exact description, reference being had to the p p 5 leading to the 1 n of th head a('.('on1 )a11yi11g drawings. 3 and it is provided with a valve 6 and pet- Thi invpnfion l t t hi h d l cockT. The connections between-the boiler water alarm for steam boilers and is par- Water 0011mm 1 and e head 3 e Such that ticularly designed as an improvement over the level of water in the boiler water column my prior application for low water alarm 15 ntained in the head 3 S0 that y for ste boil r fil d th 5th d f N variation in the level of the water in column vember, 1906. Sci". No. 342.015, wherein a 1 is brought about in the column T head which is normally filled with water y Operated Contacts are P ded upon and which is automatically converted into a the regulator Column 3 and While y are steam head when the water in the boiler qh Similar in pp ce they a e very reaches a certain low water mark is .prodlflerent in construction and will therefore vided with a thermally operated contact of be described d p ndently. a construction such that upon the conver- The g Water COHtaCt device comprises sion of the head into a steam head the cira o p thermostatic b r m d up Of a cuit will be closed through an alarm system p Q Steel 8 Secured throughout its length, and the engineer will be notified that the m'efemhly y Soldering, to a Strip 9 f Z ncwater has become too low in the boiler. s r s formed in a loop of a size such More specifically the invention comprises that when it is S ed t0 the head 3 it Will a head which is used in connection with a Surround the me nd be in close proximity water column connected to a boiler and is it SO that h may readily act upon the provided with suitable means for supplying metals and bring about the thermostatic acit ith Steam d t f th t r tion. The bar is secured to the head above column. This head has thermally cone er ne by means of a screw 10 passtrolled contacts which are arranged in a g through the foot f it bracket 11 Which manner such that when the water reaches is edfr m th bar and carries a con low water mark one of these devices will tact 12. A suitable lead 13 is connected to complete an alarm circuit and nd th the bracket 11 and forms one portion of the alarm, while the other device in a somewhat CirCllit Wh e another lead 14: is secured to similar manner will be actuated to complete e b Th s compound bar and its Contact an independentalarm circuit to sound the r w 12 are arranged in a manner such that high water alarm, or, as shown in the drawe fr e end of the bar iS normally out Of ings,an indicator may be used in connection g g ment With the screw, but when the with the alarm to show just what the con- Witter r se-S and there is a change in temdition of the water is in the boiler. perature, the action of the bar is to cause its The invention may he further briefly ree end to move out into engagement with summarized as, consisting in the constructhe Con act screw and to thereby complete tion and combination of parts hereinafter the alarm Circu t for t e h gh W ter alarm. i set forth inthe following drawings, deh Compound bar is arranged with the scription and claims. zinc strip outside on account of the fact that Referring to the drawings Figure 1 shows i trip h a gre ter C0eificient 0f expanmy device in section applied to a water sion than steel, and hence when the upper column also in section and also connected to part of the head 3 is filled with steam it an alarm and indicator system; Fig. 2 is a contracts the loop and therefore holds it out section upon the line A-A of Fig. .1; and of engagement with the contact screw 12, Fig. 3 is a section upon the line B-B of but upon the water rising to a point where Fig. 1. r the steam is excluded from this part of the Any preferred form and construction of head, the temperature about this bar is lowcred whereby the zinc strip 9 contracts with the result that the loop is expanded and the contact screw 12 is engaged thereby.

The low water alarm, shown as the lower contact device in Fig. 1 and more fully normal water level point above this device the bar remains out of 'engagement with its contact. screw, but upon the water sinking below it the head is converted into a steam head at'this point with the result that the increase in temperature due to the presence of the steam causes the bar to expand and complete the circuit through the low water alarm side of the system.

Having described my invention, I claim:

1. In a high and low water alarm for steam boilers, a head in open communication with the boiler and having a steam and water space, a thermostatic bar and contact mounted upon tlienornialsteam ortion of said head and adapted to be brougiit into engagement when the water rises in said steam portion, another thermostatic bar and contact upon the water portion of said head and adapted to be brought into engagement upon the sinking of the water in the head and due to change of temperature caused by the presence of steam in that portion of the head, and an alarm system operated by said con tacts.

2. In a high and low water alarm for steam boilers, a head in open communication with the boiler and having a steam and water space therein, a contact mounted on said head above the normal waterline, a thermostatic loop secured to the head, surrounding the same, and having its free end out of engagement with said contact when steam is present in that portion of the head,

said loop being adapted to on age its contact by a change in temperature no to the presence ofwater in that portion of the head, another contact carried by said head and below the normal water level line, another thermostatic loop cooperating therewith and secured to the head and having its free end normally out of engagement with but upon movement adapted to engage its contact, such movement being caused by a change in temperature due to the presence of steam in that portion of the head, and an alarm circuit adapted to be completed to sound the alarm by the high and 10; water contact devices.

3. In a high and low water alarm for steam boilers, a head in communication with the boiler whereby the water level in the latter is maintained in the former, a contact mounted upon said head, a thermostatic loop cooperating therewith and secured to the head and comprisin an outerstrip of zinc and an inner strip 0 steel, said contact and loop being arranged in a manner such. that the zinc is acted upon by the heat from steam in that portion of the head so that it contracts the loop and holds the free end thereof out of engagement with its contact, an-

other contact carried by said head below the normal water line, another thermostatic loop cooperating therewith and secured to the head and comprising an outer strip of steel and an inner strip of zinc and arranged in a manner such that when water is present in that portion of the head, the loop is out of engagen'ient with its contact, but upon the presence of steam in that portion of the head, the zinc is expanded and the free end of such loop is brought into engagement with such contact, and an alarm system adapted to be set into operation by the contacting of all of said loops with their contacts.

In testimony whereof I aflix my signature in the presence of two witnesses.

CHARLES BRENT.

the free end of 

